I notice a difference: facebook acquires other social networks and seems to be enough big to sustain that. What if they have 40 million users in ten years? And

I notice a difference: facebook acquires other social networks and seems to be enough big to sustain that. What if they have 40 million users in ten years? And never generate a dime of serious profit in the meantime. Then it would be a net loss. But 3B loss for a possible 1 billion customers sustainable business is not huge.